[Xen-devel] Re: [PATCH][BALLOON] Fix minimum target

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 27 May 2006, at 21:34, Puthiyaparambil, Aravindh wrote:

> Dom0 needs a much bigger floor of 192M. I think this is where KY came 
> up
> with the 192M number. I know this will cause problems on machines 
> coming
> up with dom0_mem<192M.
That being the case (which it certainly is) it is pretty obvious that a 
floor of 192M is not suitable in all situations.
> Both these options will break xm-test. So how do you want to proceed?
If there isn't a suitable static minimum which prevents OOM death on 
most systems without also impacting the useful lower range of 
ballooning on other systems then I think we'll have to wait for someone 
to implement a more dynamic scheme (e.g., by hooking off the 
OOM/low-memory paths, or by slowly allocating memory only when we can 
see a reasonable amount of pages available on the free lists).
I'm rather doubtful that a really good static estimate can be derived, 
since it depends so much on particular details of kernel memory usage. 
Given the results of these experiments I'm tempted to remove the 2% 
minimum that is already in the tree -- vendors can make their own patch 
if they have a better idea of what works for their particular kernel 
setups.
 -- Keir


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